47GB RAM usage from kwin_wayland after wake up

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Hi there.
I am having a very high memory usage after sleeping and waking my system up. I have 64GB ram and when the system wakes up I see a very high ram usage. In htop, kwin_wayland seems to be using around 75% CPU and 75% RAM (47GB).

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I’ve Fedora 41 as OS, KDE as desktop environment, sddm as display manager, nvidia as gpu and I have proprietary drivers installed.

Sleep feature is basically unusable at the moment. I get OOM and full system freeze issues if I start something that use some RAM like a browser, VSCode, or a virtual machine after waking up. It basically consumes all available ram and I am guessing high cpu usage is caused by garbage collector.

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I’m having a very similar issue on Kubuntu 25.04 (high RAM usage) except for I don’t have the same CPU usage issue. Curiously, the high RAM usage doesn’t appear to affect me using my computer and it just casually idles in the 90% range. Occasionally it resets back down and climbs back up slowly but I don’t really notice. The only problem it’s been causing me is inability to hibernate (since swap isn’t big enough) but normal sleep seems to work fine.

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This Arch Wiki post may or may not be related: Memory Leak with Wayland? / Newbie Corner / Arch Linux Forums

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And the relevant bug: 496469 – Memory leaks and instabilities with different GPUs driving multi-monitor setups when a screen wakes / is added

With some communication happening with Nvidia driver developers.

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